Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
This circuit is from 1964 documentation but can be easily implemented based on current components....
This circuit was obtained in an English publication of 1975. It is a circuit that stabilizes an...
We found this circuit in the April 1975 Radio Electronics magazine. The circuit has a latch and...